Variable Overload Relay

Yes you can change from one settings group of the relay ( 2 vibro feeders) to another settings group (3vibro feeders ) when the third is switched on by detecting its status . We use SEL Motor relay.

Each feeder should be independantly overload protected as should the conveyor for the protection of the devices and all associated circuitry. I just don't understand the problem.

I agree with RDGRNR, separate overloads should be used for each vibrator motor to protect the individual motors (which is common industrial practice and solves the problem). Are you connecting multiple vibrator motors to a variable speed drive or contactor output? It sounds like someone was trying to save money by only using a single overload (the last time I saw this being employed on contactor-controlled vibrator motors it didn't end well for the motors).

I suspect that there may be a misintepretation here.

If CAN make sense that there's too much flow coming out (or too much stuff has already come out) of the first pair of feeders or all three feeders. In that case, a high-flow alarm could trip when the first two feeders, if they're the only ones on, feed too much stuff to the conveyor; if all three feeders are running, then another alarm could trip. One of the these alarms, when selected (depending on how many feeders are working), could serve to shut off the feeders and the conveyor.

That being said, the alarms would be high-flow alarms or perhaps 'too much stuff's been fed' alarms; they're not conveyor-protection alarms. The alarm condition could be detected by monitoring the conveyor's load, I suppose, but it wouldn't be a protection for the conveyor's motor. A separate protection circuit would be needed for that.

Cheers! DZ

Check Electronivc Over load relays. setting can will be changed as per the load. you have to make sure that the electronic relay knows how many feeders are operating

Vasuki Rao

Dear Sir

modern numerical relays have more than one setting groups. You can use different setting groups for different combination of use. Setting groups can be changed through binary inputs. These binary inputs can be related to the switching of the loads, here in your case conveyors.

for more in formation please go through manual of any numerical relay like Mi COM relays etc.

regards

raju